Anisotropic filtering really helps with grid textures, but right now the only way to use it in A-Frame is to muck about with three.js.
Updated missing url https://rawgit.com/bryik/aframe-bmfont-text-component/master/dist/aframe-bmfont-text-component.min.js to https://cdn.jsdelivr.net/gh/bryik/aframe-bmfont-text-component/dist/aframe-bmfont-text-component.min.js
https://aframe.io/releases/0.3.0/aframe.min.js
https://rawgit.com/bryik/aframe-bmfont-text-component/master/dist/aframe-bmfont-text-component.min.js